The production of high-performance wet strength agents is a critical process for the paper industry, enabling paper products to maintain their integrity and strength even when exposed to moisture. Mastering this production requires a deep understanding of the chemical processes and the raw materials involved, with the WSR intermediate playing a central role.

At its core, the process of how to make wet strength agent involves reacting a precursor with epichlorohydrin. The most common and effective precursor used in this synthesis is a polyamide aqueous solution, often referred to as the WSR intermediate. This intermediate is produced from dibasic acid and polyamine through a high-temperature dehydration and condensation reaction, often aided by a catalyst. The resulting polyamide aqueous solution is a stable base material. The subsequent reaction with epichlorohydrin, typically carried out under controlled temperature conditions (e.g., 50-70ºC) and pH adjustments, leads to the formation of the final polyamide-epichlorohydrin (PAE) polymer. The quality of the WSR intermediate directly influences the degree of polymerization and, consequently, the final wet strength agent's performance and storage stability.


For companies operating in the paper chemical sector, sourcing a reliable WSR intermediate supplier is a key factor for success. NINGBO INNO PHARMCHEM CO.,LTD., a leading manufacturer in China, offers a high-quality WSR intermediate with consistent specifications. These include its light yellow transparent liquid appearance, a solid content of at least 40%, and a pH range of 7-10. The viscosity is carefully controlled to facilitate processing. Understanding the price of WSR intermediate is important, but it should always be balanced with the assurance of quality and consistency. A dependable supplier ensures that the batch-to-batch variations are minimal, which is crucial for reproducible results in wet strength agent manufacturing.


The advantages of utilizing a well-synthesized WSR intermediate are significant. It allows paper manufacturers to achieve higher humidification strength effects, meaning the paper retains more of its original strength when wet. Furthermore, the stability of the synthesized wet strength agent is markedly improved, extending its shelf life and ensuring its effectiveness over time. This translates to better product quality for the end-user and reduced waste for the paper mill. The ability to precisely control the reaction process, starting with a high-quality intermediate, is what sets leading paper chemical producers apart.


As a supplier and manufacturer, NINGBO INNO PHARMCHEM CO.,LTD. is dedicated to providing the chemical building blocks necessary for innovation in the paper industry. The WSR intermediate is not just a chemical; it is an enabler of enhanced paper performance. For any paper chemical company looking to produce superior wet strength agents, investing in a quality WSR intermediate from a trusted source like NINGBO INNO PHARMCHEM CO.,LTD. is a fundamental step towards achieving their production goals and meeting market demands for more durable and resilient paper products.